EP 0238575 B1 19890802 - VANILLIN PRODUCTION PROCESS
Title (en)
VANILLIN PRODUCTION PROCESS
Publication
Application
Priority
DE 3533562 A 19850920
Abstract (en)
[origin: WO8701695A2] In a vanillin production process, a liquid mixture containing vanillin and water is extracted with carbon dioxide at a temperature from 0<o> to 110<o>C and a pressure from 30 to 400 bar, after which the vanillin is separated. The carbon dioxide-containing vanillin is led at the extraction temperature and pressure through an aqueous solution of sulphite or hydrogen sulphite, this solution is then acidified with sulphuric acid to a pH value between 2 and 4, and the vanillin-free carbon dioxide is returned to the extraction stage.
IPC 1-7
IPC 8 full level
C07C 47/58 (2006.01); C07C 45/00 (2006.01); C07C 45/78 (2006.01); C07C 45/80 (2006.01); C07C 45/82 (2006.01); C07C 67/00 (2006.01)
CPC (source: EP US)
C07C 45/783 (2013.01 - EP US); C07C 45/82 (2013.01 - EP US)
C-Set (source: EP US)
Designated contracting state (EPC)
FR GB SE
DOCDB simple family (publication)
WO 8701695 A2 19870326; WO 8701695 A3 19870702; BR 8606880 A 19871103; CA 1260498 A 19890926; CN 86106327 A 19870513; DE 3533562 A1 19870402; DE 3533562 C2 19880218; EP 0238575 A1 19870930; EP 0238575 B1 19890802; FI 85973 B 19920313; FI 85973 C 19920625; FI 872046 A0 19870508; FI 872046 A 19870508; JP S63500942 A 19880407; US 4898990 A 19900206
DOCDB simple family (application)
EP 8600526 W 19860912; BR 8606880 A 19860912; CA 518442 A 19860918; CN 86106327 A 19860919; DE 3533562 A 19850920; EP 86905778 A 19860912; FI 872046 A 19870508; JP 50505486 A 19860912; US 28951688 A 19881227